Table 4

Univariable analyses of predictor variables of practice admission rate (n=145) 2007/8

 Variable IRR (95% CI) % Change p Value Total clinical points 0.998 (0.99 to 0.999) −0.2% 0.02 Total organisational points 0.998 (0.99 to 0.999) −0.2% 0.04 % Satisfied with phone access 0.995 (0.99 to 0.998) −0.5% 0.003 % Able to book 2 days ahead 0.996 (0.99 to 0.999) −0.4% 0.0008 % Able to get appointment in 48 h 0.99 (0.98 to 0.997) −1.0% 0.0007 % Able to book with a specific GP 0.99 (0.98 to 0.996) −1.0% 0.0001 % Satisfied with opening hours 0.99 (0.98 to 1.01) −1.0% 0.21 Distance from hospital (miles) 0.98 (0.97 to 0.99) −2.0% <0.0001 % of Practice male 0.99 (0.97 to 1.02) −1.0% 0.46 Age (% of practice patients 65+ years) 1.01 (0.99 to 1.02) 1.0% 0.1 Practice deprivation score 1.01 (1.009 to 1.02) 1.0% <0.0001 % of Practice white ethnicity 0.998 (0.995 to 0.999) −0.2% 0.02 Size of practice (no of patients) 0.99998 (0.99997 to 0.99999) −0.002% 0.0003 Coronary heart disease prevalence 1.09 (1.03 to 1.16) 9.0% 0.002 % Response rate to access survey 0.99 (0.98 to 0.998) −1.0% 0.006
• N=145 for all variables.

• Figures in the second column are incident rate ratios (IRR). Subtracting 1 from the IRR and then multiplying by 100 gives the percentage change in the expected admissions count for a 1 unit increase in the predictor. So for practice deprivation score, for every extra deprivation point, the expected admissions count increases by 1%. IRR less than 1.0 represent decreases and IRR greater than 1.0 represent increases in the count. Statistical model: negative binomial regression, using log of the list size as the offset.

• GP, general practitioner.